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Commit 6c4841c2 authored by Anton Blanchard's avatar Anton Blanchard Committed by Paul Mackerras
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[POWERPC] Never panic when taking altivec exceptions from userspace 



At the moment we rely on a cpu feature bit or a firmware property to
detect altivec. If we dont have either of these and the cpu does in fact
support altivec we can cause a panic from userspace.

It seems safer to always send a signal if we manage to get an 0xf20
exception from userspace.

Signed-off-by: default avatarAnton Blanchard <anton@samba.org>
Signed-off-by: default avatarPaul Mackerras <paulus@samba.org>
parent 60b2a46c

arch/powerpc/kernel/traps.c

+1 −2
Original line number Original line Diff line number Diff line
@@ -900,14 +900,13 @@ void kernel_fp_unavailable_exception(struct pt_regs *regs) 




void altivec_unavailable_exception(struct pt_regs *regs)

void altivec_unavailable_exception(struct pt_regs *regs)

{

{

#if !defined(CONFIG_ALTIVEC)

	if (user_mode(regs)) {

	if (user_mode(regs)) {

		/* A user program has executed an altivec instruction,

		/* A user program has executed an altivec instruction,

		   but this kernel doesn't support altivec. */

		   but this kernel doesn't support altivec. */

		_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);

		_exception(SIGILL, regs, ILL_ILLOPC, regs->nip);

		return;

		return;

	}

	}

#endif



	printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception "

	printk(KERN_EMERG "Unrecoverable VMX/Altivec Unavailable Exception "

			"%lx at %lx\n", regs->trap, regs->nip);

			"%lx at %lx\n", regs->trap, regs->nip);

	die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);

	die("Unrecoverable VMX/Altivec Unavailable Exception", regs, SIGABRT);